Which gas is filled in balloon?

Answer 1

The gas is helium or hot air.

Answer 2

That depends on the type of balloon. Rubber balloons are typically filled with air (from the lungs or from a hand-pump), but can also be filled with lighter-than-air gasses such as helium. Hot-air balloons are filled with, you guessed it, hot-air, which is less dense than the surrounding unheated air. Hydrogen balloons are filled with hydrogen but since the Hindenburg airship disaster, hydrogen is no longer used -- modern airships use helium.
did you mean balloon? if so, the gas in the balloons is helium gas.

Answer 3

well helium goes in a balloon when you blow it up if you want it to float. Otherwise you can just blow it up with your lungs - which would fill it with some oxygen, some nitrogen, some carbon dioxide, and some water vapor (along with whatever trace gases might be present in your breath).

Answer 4

Helium is the typical gas found in a balloon although you can blow one up with air. The only concern in that is that the balloon will not float

Answer 5

In very big hot air balloons Helium gas is used whereas in small balloons hydrogen is used because it is cheaper and reasonable than Helium. Both of these gases are lighter.

Answer 6

Balloons are usually filled with Helium gas.

Answer 7

To make them lighter than air 'helium' is used.